According to a recent interview with Jamie Hewlett, the co-creator and illustrator of the internet band, he said that “Usually we have a good five-year break between each album but we decided: ‘You know what? Let’s keep going’ because there’s ideas for a few more albums so we’re going to go straight into that. So that will be all of next year and probably the year beyond that.”
Full interview (Quote at about 10:20)
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https://www.stereogum.com/1976364/a-new-gorillaz-album-is-coming-next-year/news/